Studio Geotecnico Italiano

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Studio Geotecnico Italiano

Studio, Italy
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Pasqualini B.,Technip | Nicotera E.,Technip | Liberati A.,Technip | Marcellini R.,Technip | And 2 more authors.
Proceedings of the 5th International Conference on Geotechnical and Geophysical Site Characterisation, ISC 2016 | Year: 2016

This paper presents and discusses results of the first 25 weeks of monitoring on trial embankments aimed to obtain parameters for foundation design for an industrial development. The area (60 ha) is covered by a thick (2÷6 m) layer of a material denominated "pitch", constituted by a mix of natural soil and residual bituminous material from past industrial processes. The design involves the construction of an embankment, 3÷4 meters thick, acting as a capping, and avoiding excavations and dewatering in the contaminated soil. For the estimate of parameters for foundation design, it has been deemed unrealistic to use the traditional correlations with the most common in-situ tests. Reliability of laboratory tests to estimate site behavior is also questionable. Hence, a monitoring system of three trail embankments has been built on an area (about 30 m width) that is reasonably representative of the stress increase in the operating conditions. © 2016 Australian Geomechanics Society.

Vanini M.,Polytechnic of Milan | Faccioli E.,Studio Geotecnico Italiano | Luzi L.,Italian National Institute of Geophysics and Volcanology | Pacor F.,Italian National Institute of Geophysics and Volcanology | Paolucci R.,Polytechnic of Milan
Bulletin of Earthquake Engineering | Year: 2017

Paper describes the extensive work done in the SIGMA project, aimed at improving knowledge on data, methods and tools to better quantify uncertainties in seismic hazard assessment (SHA). The authors cooperated in the study of potential faults and geological structures, earthquake catalogues, selection of ground motion prediction equations, and methods for site effect evaluation suitable for SHA. All the contributions merged into a probabilistic seismic hazard study conducted for three representative sites of the Po Plain in Northern Italy. Po Plain is a low-to-moderate seismicity region, characterized by some critical features, such as blind faulting and deep alluvium sediments, and by scarcity of strong motion data; these sources of uncertainties in seismic hazard estimation are common to other low seismicity areas around the world. Within SIGMA, special care was devoted to: (a) the use of the single station sigma approach inside the probabilistic SHA, (b) the comparative use of generalized attenuation functions to evaluate the hazard contribution of composite fault systems, and (c) the study of the epistemic uncertainties at play when different modelling approaches to site effects are used. © 2017 Springer Science+Business Media Dordrecht

Faccioli E.,Studio Geotecnico Italiano | Faccioli E.,Polytechnic of Milan | Paolucci R.,Polytechnic of Milan | Vanini M.,Polytechnic of Milan
Bulletin of the Seismological Society of America | Year: 2015

Site-specific ground-motion hazard, as assessed by a probabilistic seismic- hazard analysis one-step approach that handles a single-site sigma and its uncertainties and uses a simple logic tree, is compared with a two-step approach that includes bedrock motion evaluation and wave propagation through a local soil profile with consideration of the main epistemic uncertainties. The one-step analysis relies on accelerometer data from the Po Plain, a sedimentary basin in northern Italy where an earthquake sequence with two Mw ∼ 6:0 events was extensively recorded in 2012. Uniform hazard spectra (UHS) on soil and exposed bedrock are evaluated at three deep-soil accelerometer sites (MRN, NVL, and T0821), using residual measures available from other studies, by which uncertainties in site terms (δS2S) and single-site sigma (σss,s) are estimated. Despite similarity in geologic conditions, at least one out of three sites in the one-step analysis displays substantial differences in mean level (T0821) or in the (84–16) percentile spread (NVL), depending on differences in site terms and single-site sigma, possibly caused by source-to-site propagation effects. The two-step approach was applied to the remaining site (MRN) using carefully selected and broadband-matched acceleration signals and linear, equivalent-linear, and nonlinear approaches as excitation in propagation analyses.We found that assumptions on soil degradation curves dominate the variability of results. The linear approach provided the best results, based on (1) the similarity of the one-step nonergodic UHS with the two-step result based on the linear approach; (2) the comparison with observed records at MRN during the 2012 sequence mainshocks, showing peak ground acceleration and short-period spectral levelswell beyond those predicted by different nonlinear assumptions; and (3) similar evidence from a set of 21 stations at deep soil sites of the Japanese KiK-net. © 2015, Seismological Society of America. All rights reserved.

Vanni D.,Trevi Spa | Siepi M.,Trevi Spa | Macchi S.,Studio Tecnico Macchi | Pastore V.,Studio Geotecnico Italiano
Geotechnical Special Publication | Year: 2012

In Venice a major renovation of San Marco Bell Tower takes advantage of the peculiarities of the deep mixing. This project is drawn up by the Ministry of Infrastructure and Transportation and Venice Water Authority, through the concessionary Consorzio Venezia Nuova. The famous Bell Tower collapsed at the beginning of last century, and was promptly re-constructed. However, the new construction now shows severe signs of distress and needs major improvement of its foundation. Soil improvement by cement mixing, formed by secant columns 400 mm diameter, will allow a safe excavation of small chambers at the four corners of the tower. The chambers will be used to install titanium tie-rods to secure the rock blocks which form the Bell Tower footing, and will remain usable in the future, to monitor the base of the tower. The deep mixing method (DMM) has been chosen for the limited impact of the fragile surrounding environment. The concerns of the Assessore alle Belle Arti (Fine Arts responsible) of the Venice Municipality and of the design team, is that the jet grouting would have possibly caused overpressures and instabilities in the surroundings monuments. Problems to overcome, among the other typical problems of the technology, are that of the presence of obstructions, the limited work space available, the need to dispose of the spoil return, the flood of the working area during peak high tide (acqua alta), the limited noise and vibration emission allowed. All activities are carried out in confined spaces to minimizing the disruption to millions of tourists who visit the tower and the beautiful Piazza San Marco and Basilica. © 2012 American Society of Civil Engineers.

Fioravante V.,University of Ferrara | Giretti D.,University of Ferrara | Jamiolkowski M.,University of Turin | Rocchi G.,Studio Geotecnico Italiano
Bulletin of Earthquake Engineering | Year: 2012

The paper reports the results of laboratory testing of dense sandy gravel carried out on large dimension undisturbed samples, obtained by means of in situ freezing technique. The specimens, 290 mm in diameter and 600 mm high, have been subjected to undrained cyclic triaxial tests carried out in isotropically and anisotropically consolidated conditions aimed at investigating sandy gravel susceptibility to cyclic mobility and plastic strain accumulation during earthquake induced vibrations. The quality of the undisturbed samples was corroborated by comparing the field shear wave velocities against those inferred from bender element tests, carried out in the triaxial apparatus after the specimen consolidation. The cyclic tests were supported by a series of monotonic undrained and drained triaxial tests performed on isotropically and anisotropically consolidated specimens to help in their more rational interpretation. The tests yielded valuable information as to the susceptibility of the sandy gravel in hands to cyclic mobility and plastic strain accumulation during earthquake loading. © 2012 Springer Science+Business Media B.V.

Schroeder F.C.,Geotechnical Consulting Group LLP | Merritt A.S.,Geotechnical Consulting Group LLP | Menkiti C.O.,Geotechnical Consulting Group LLP | Caianiello M.,Studio Geotecnico Italiano | And 2 more authors.
Numerical Methods in Geotechnical Engineering - Proceedings of the 8th European Conference on Numerical Methods in Geotechnical Engineering, NUMGE 2014 | Year: 2014

Colosseo/Fori Imperiali is a key station of the San Giovanni-Venezia stretch on the new Metro Line C in Rome, Italy. It provides interchange facilities to the existing Line B and direct access to some of Rome's most important monuments, including the Colosseum and the Basilica di Massenzio. The works are ongoing in 2014 and the station comprises excavations for the main station box, which is in excess of 30m deep, approximately 130m long and up to 42m wide, as well as for a sub-station and station entrances, which are around 8m depth. There is a minimum distance of approximately 10m between the station and the Basilica, which was the largest building of the Roman Forum but its remains are now in a cracked and vulnerable condition. Given the historic importance of the Basilica and the close proximity of the station, ground movements had to be predicted and their potential effects on the monument required careful consideration. This paper presents the 3D FE analysis that was undertaken to enable this assessment and determine requirements for additional mitigation measures. Some mitigation measures were already implemented, including alignment refinement to optimize the box configuration and to position it as far from the monument as practicable, the use of stiff retaining wall systems, sufficiently deep to cut-off groundwater flow, and emphasis on good construction control. The analysis results demonstrated that, despite the large depth and size of the excavation for the final station box configuration, the effects on the monument would be minimal and so active intervention at the Basilica could be limited to detailed monitoring, temporary support and some strengthening work. © 2014 Taylor & Francis Group, London.

Rocchi G.,Studio Geotecnico Italiano | Vaciago G.,Studio Geotecnico Italiano | Callerio A.,Studio Geotecnico Italiano | Fontana M.,Autosoft | Previtali R.,Studio Geotecnico Italiano
Landslides | Year: 2014

This paper presents a proposal, developed as part of the EC-sponsored SafeLand project, to supplement existing landslide classifications with a more detailed description of the geomechanical characteristics of the materials to include the effects of “structure” and stress history, as determined by depositional and post-depositional processes. This provides a valuable insight into and a rational basis for the modelling of the physical mechanisms that govern the triggering and subsequent development of landslides. The classification, behaviour and minimum requirements for the constitutive modelling of saturated clays and sands are summarized here. The use of advanced constitutive models which include, where necessary, progressive damage to the microstructure of the material helps to predict the conditions and the style of triggering and of subsequent movement of landslides, depending on the type of material, even in first time landslides. Numerical examples are presented, illustrating the different response to rapid perturbation of sensitive clays versus mechanically overconsolidated clays and of “loose” sands versus “dense” sands. © 2013, Springer-Verlag Berlin Heidelberg.

Mazzieri F.,Marche Polytechnic University | del Frate A.,Studio Geotecnico Italiano | Monti G.,Studio Geotecnico Italiano
Chemistry and Ecology | Year: 2011

This article describes laboratory tests carried out to identify an effective stabilisation/solidification method for soils contaminated by chlorinated pesticides at a disused industrial site. The effectiveness of the treatment was evaluated using leach tests. Powdered activated carbon (PAC) was used as the primary amending agent, thanks to the strong affinity for organic molecules and high sorption capacity. For some areas of the site, test results showed that treatment with PAC was decisive in reducing leaching of the pollutants below the prescribed limits. For areas with higher concentrations, treatment with PAC alone was not sufficient, although the reduction was significant. According to a detailed programme, further tests were performed: different percentages of cement were added to the soil-PAC mixture as a binding/solidifying agent. For all the agents, the optimum dosage that led to dissolved phase concentration standards for pesticides was identified. The test results are evaluated in view of possible field applications. Factors to be further addressed for an overall evaluation of the technology are discussed.© 2011 Taylor & Francis.

Rocchi G.,Studio Geotecnico Italiano | Vaciago G.,Studio Geotecnico Italiano
Landslide Science and Practice: Spatial Analysis and Modelling | Year: 2013

A proposal to supplement existing landslide classifications with a more detailed description of the geomechanical characteristics of the materials to include the effects of "structure", stress history and initial state has been developed as part of the EC sponsored SafeLand project. This approach provides a valuable insight into and a rational basis for the modelling of the physical mechanisms that govern landslide triggering and subsequent development. The classification, behaviour and modelling of saturated clays and sands is summarized here. The use of advanced strain hardening plasticity models which, where necessary, include progressive damage to the "structure" of the material helps to replicate mechanical weathering, delayed failure and the triggering of flows or slides, depending on the type of material. A numerical example is presented, illustrating the different response of sensitive clays and mechanically overconsolidated clays to rapid erosion or excavation. More details of the proposed geotechnical classification and other numerical examples may be found in Deliverable 1.1 of the SafeLand project. © Springer-Verlag Berlin Heidelberg 2013.

Vaciago G.,Studio Geotecnico Italiano
Landslide Science and Practice: Risk Assessment, Management and Mitigation | Year: 2013

A compendium of structural and non-structural mitigation measures for different landslide types has been developed as part of the EC sponsored SafeLand project, to be used both as a basis for a web-based "toolbox" also developed as part of the project and more generally as a resource for a wide variety of users. Emphasis has been placed on providing a rational framework applicable to all the measures listed in the compendium, classifying them in relation to the terms of the "risk equation" (hazard, vulnerability, elements at risk) addressed by the specific mitigation measure. Hazard mitigation measures are subdivided in relation to the physical processes involved. The compendium is supplemented by fact sheets that provide specific guidance on hazard mitigation measures, including a brief description, guidance on design, schematic details, practical examples and references, as well as subjective (provisional) ratings of their applicability in relation to the descriptors used for classifying landslides. More details of the various mitigation measures considered may be found in Deliverable 5.1 of the SafeLand project. © Springer-Verlag Berlin Heidelberg 2013.

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